Linux problem summary

Linux problem summary
1. Modify the redhat performanise5 Language

Problem description: language change

Cd/etc/sysconfig Vi i18n Set LANG = en_US.UTF-8 Change to LANG = zh_CN.gb2312

2. bash: ifconfig: command not found

Problem description:

Switch to the root user
[Root @ localhost/] $ ifconfig
Still prompt: "bash: ifconfig: command not found"

Whereis ifconfig Method 1: [root @ localhost sbin] $/sbin/ifconfig Method 2: [root @ localhost sbin] $ export PATH = $ PATH:/sbin. After this setting, you can directly access it next time, eliminating the first type of trouble. Method 3: Modify the/etc/profile file and comment out the if statement. Comment out the following if statement: # Path manipulation If ["$ EUID" = "0"]; then Pathmunge/sbin Pathmunge/usr/sbin Pathmunge/usr/local/sbin Fi Change # Path manipulation # If ["$ EUID" = "0"]; then Pathmunge/sbin Pathmunge/usr/sbin Pathmunge/usr/local/sbin # Fi

3. redhat linux enters the command line after it is started.

Vi/etc/inittab id: 5: initdefault: change 5 in this sentence to 3.

4. Failed to install JDK in redhat

The following error occurs when installing the jdk-7u21-linux-i586.tar.gz in red hat enterprise linux5:

Error: dl failure on line 864 Error: failed/home/jiangyang/jdk1.7.0 _ 21/jre/lib/i386/client/libjvm. so, because/home/jiangyang/jdk1.7.0 _ 21/jre/lib/i386/client/libjvm. so: cannot restore segment prot after reloc: Permission denied

Solution:

Chcon-t textrel_shlib_t $ JAVA_HOME/jre/lib/i386/client/libjvm. so

5. Set the root permission for mysql remote connection

Mysql> Grant all privileges on *. * to 'root' @ '%' identified by 'Password' with grant option; (% Indicates all external machines. If a specific machine is specified, change % to the corresponding machine name; 'root' indicates the user name to be used ,) Mysql> flush privileges; (Run this statement to take effect, or restart MySQL)

6. configure a static IP address in ubuntu

Root @ ubuntu1 :~ # Vi/etc/network/interfaces

# This file describes the network interfaces available on your system # And how to activate them. For more information, see interfaces (5 ). # The loopback network interface Auto lo Iface lo inet loopback # The primary network interface Auto eth0 Iface eth0 inet static Address 192.168.2.111 Netmask 255.255.255.0 Gateway 192.168.2.1

Root @ ubuntu1 :~ #/Etc/init. d/networking restart

If the dynamic IP address is configured as follows:

# This file describes the network interfaces available on your system # And how to activate them. For more information, see interfaces (5 ). # The loopback network interface Auto lo Iface lo inet loopback # The primary network interface Auto eth0 Iface eth0 inet dhcp

7 install chkconfig in Ubuntu

There is no chkconfig command in Ubuntu and the chkconfig command is used by installing the chkconfig_11.0-79.1-2_all.deb.

8. Install ubuntu mysql

Install mysql-6.0.7-alpha-linux-i686-glibc23.tar.gz linux.

Groupadd mysql Useradd-g mysql Cd/usr/local Gunzip </path/to/mysql-VERSION-OS.tar.gz | tar xvf- Ln-s full-path-to-mysql-VERSION-OS mysql Cd mysql Chown-R mysql. Chgrp-R mysql. Scripts/mysql_install_db -- user = mysql Chown-R root. Chown-R mysql data Bin/mysqld_safe -- user = mysql & /Usr/local/mysql/bin/mysqladmin-u root password 'new password' Cp support-files/mysql. server/etc/init. d/mysql Chmod + x/etc/rc. d/init. d/mysql Chkconfig -- add mysql Cp support-files/my-medium.cnf/etc/my. cnf Service mysql start

9. mysql garbled characters in linux

If mysql is used in linux, garbled characters may occur at noon. By querying the mysql replica set, you can find that latin1 needs to be modified.

Modify the/etc/my. cnf configuration file.

# The following options will be passed to all MySQL clients [Client] # Password = your_password Port = 3306 Socket =/tmp/mysql. sock Default-character-set = utf8 # Here follows entries for some specific programs # The MySQL server [Mysqld] Port = 3306 Socket =/tmp/mysql. sock Skip-locking Key_buffer = 16 M Max_allowed_packet = 1 M Table_cache = 64 Sort_buffer_size = 512 K Net_buffer_length = 8 K Read_buffer_size = 256 K Read_rnd_buffer_size = 512 K Myisam_sort_buffer_size = 8 M Default-character-set = utf8

After the database is restarted, view the region set information of the database again.

/Etc/init. d/mysql stop /Etc/init. d/mysql start